Apparatus for false twisting yarn

ABSTRACT

A false twisting head having a rotatable drive shaft which head is slidably mounted on a fixed support in a direction transverse to the drive shaft axis. Means are provided for urging the head in one or the opposite direction with respect to the support to engage the drive shaft with one or the opposite sides of an endless moving drive belt.

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[s41 APPARATUS FOR FALSE TWISTIN 3,058,289 10/1962 Raschle ..s7/77.45 x YARN 3,074,225 1/1963 Scragg ..57/77.45 3,074,226 1/1963 Hilbert ...57/77.45 [72] l 9 2 E r 3,115,743 12/1963 Brodtmann... ..57/77.45 c s e 3,233,398 2/1966 Gilchrist ..s7/77.4s x [73] Assignee: Ernest Scragg & Sons Limited, Mac- 3,304,706 2/1967 Mattingly. ..57/77.45 clesfieid, England 3,385,047 5/1968 Schwabe... ...57/77.45 [22] Filed: Apt 3, 1970 3,488,678 1/1970 Bieniok ..51/77.4S

[ PP 25,533 Primary Examiner-Donald E. Watkins Attorney-None and Nolte [52] 11.8. C1. ..57/77.45 511 Km. c1.... ..D0lh mm, mm 7/46 [571 [58] FEM of Search ..57/77.377.45, A false twisting head having a rotatable drive shaft which head 57/89 104 is slidabiy mounted on a fixed support in a direction transverse to the drive shaft axis. Means are provided for urging the head [56] References Cited in one or the opposite direction with respect to the support to UNITED STATES PATENTS engage the drive shaft with one or the opposite sides of an endless moving drive belt. 2,837,889 6/1958 Comer ..57/77.45 X 2,855,750 10/1958 Schrenk et a1. ..57/77.45 X 6 C 3 Drawing Figures so 39 32 i i 29 ssifjj; 1

This invention relates to apparatus for false twisting yarn.

The invention provides an apparatus for false twisting yarn comprising a false twisting head having a rotatable drive shaft for driving a yarn engaging device, which shaft is arranged for driving engagement with an endless movable belt and which head is mounted for movement between a first position in which the shaft is on one side of the path of travel of the belt and a second position in which the shaft is on the other side of the path of travel, and means are provided for selectively biasing the head towards one or other of those positions so that the shaft can be urged into engagement with one or other sides of the belt.

The head may be mounted for linear movement between said first and second positions.

The head may be biased towards one or other of the two positions by a weight secured to one end of a tether the other end of which is anchored to the head of a location between two guides mounted on the support at locations spaced apart in the direction of said movement, the tether being led around one or other of the guides so that the weight acts to urge the head in one or other or said directions.

The guides may comprise rollers mounted on the support for rotation about horizontal axes extending transverse to said direction of movement of the head.

The mounting for the head may comprise a slide on the head which is constrained to move in a slideway on a fixed support.

The slide may comprise a rod and the slideway a sleeve in which the rod is slidably engaged.

Sliding movement of the head may be limited by the ends of a slot extending along the sleeve, in which slot a pin on the rod is slidable.

The following is a description of some embodiments of the invention reference being made to the accompanying drawings in which:

FIG. 1 is a partly sectioned side elevation of a false twist head,

FIG. 2 is a plan view of the false twist head shown in FIG. 1, and

FIG. 3 is a side elevation view of the other side of the false twist head.

Referring to FIGS. 1 and 2 of the drawings, there is shown a false twist head comprising a baseplate on which a U- shaped frame 11 is mounted with the limbs of the frame extending horizontally and spaced vertically one above the other.

The lower of the limbs of the frame is formed with a downwardly extending boss 12 the bottom face of which engages the upper face of the plate 10. The boss is formed on one side thereof with a shoulder 13 which engages a step 14 formed on the plate. The interengagement of the shoulder 13 with the step 14 locates the frame 11 in the required alignment on the plate. The frame 11 is secured to the plate 10 by a bolt 15 which extends with clearance through a hole 16 in the upper limb of the frame and a hole 17 in the lower limb and the boss and is screw threaded at its lower end which is received in a screw threaded hole (not shown) in the plate 10. The bolt 15 has a face 18 towards the lower end thereof which abuts the upper face of the lower limb of the frame so that the limb is clamped to the plate. The upper end of the bolt 15 has an hexagonal head which projects from the hole 16 to enable the bolt to be readily tightened or released.

The lower limb of the frame 11 is divided into two side-byside parts by a slot extending from the free end of the limb part way along the slot, the end of the slot remote from the free end of the limb being indicated by the reference numeral 19. Extending downwardly from the two parts of the lower limb are two elliptical section struts 20 the lower ends of which are connected by a bridging piece 21. The struts are arranged so that their major axes extend transversely to said lower limb.

A bearing housing 22 is formed on the bridging piece 21 between the struts in which a roller bearing 23 is located.

A vertically extending shaft 24 located between the struts 20 rests at its lower end on the inner annulus of the bearing and has a spigot 25 which is received in the inner annulus. The shaft is of greater diameter than the minor axes of the struts 20 and the part of the shaft between the struts is encircled by a tightly fitting sleeve 26 of hard wearing synthetic material. A

horizontally moving driving belt 9 makes frictional driving engagement with the sleeve 26. The shaft extends through the slot between the two parts of the lower limb of the frame, across the U-shaped frame and is mounted at its upper end in a further bearing 27 housed in a bore in the upper limb of the frame.

Secured on the part of the shaft 24 between the limbs of the frame is a driving wheel comprising a solid cylindrical member 28 of a light nonmagnetic alloy to the periphery of which are secured two bands 29 of hard wearing rubberlike synthetic material the bands being spaced apart to form a groove 30 between them.

A pair of powerful horseshoe permanent magnets 31 (only one of which can be seen) are spaced apart by, and secured by adhesive to, a nonmagnetic support block 32. The block has a vertical hole 33 extending through it through which the aforesaid bolt 15 passes with clearance. Projecting from the side of the block adjacent the base of the U-shaped frame 11 is a cylindrical spigot 34 which extends through a hole 35 in the bend on the frame 11 and is received in a part cylindrical seat 36 formed in the upper surface of a block 37 formed on the outside of the bend of the frame 1 l.

A clamping member 38 having a part cylindrical seat 39 engages over the upper part of the spigot and is secured to the block 37 on either side of the spigot by screws 40. Loosening of the screws 40 permits the spigot to be rotated thereby rotating the support block 32 and the horseshoe magnets. The screws 40 can then be tightened to clamp the spigot in the chosen position. The purpose of this adjustment will be explained later.

The magnets 31 are arranged with like poles adjacent one another. Pole pieces 41, 42 bridge the respective like pairs of pole pieces and are secured thereto by screws 43.

As can be clearly seen in FIG. 1 of the drawings the pole pieces 41 and 42 are located with their respective projecting fingers 50 adjacent to the end faces of the cylindrical member 28 with the end faces of the fingers spaced radially inwardly of the peripheral surfaces of the bands 29.

The false twist spindle 53 which is made from steel extends parallel to the axis of the shaft 24 and is engaged by the bands 29 at two spaced locations. The spindle is formed with a peripheral flange 54 which extends into the groove 30 between the bands. The spindle is drawn into engagement with the bands by the adjacent magnetically attracting fingers the ends of which are spaced radially from the spindle by the drive wheel to provide airgaps, the magnetic circuit between the fingers being completed through the spindle. The spindle 53 is hollow and has a pin extending across its bore at one end, the yarn to be false twisted being passed through the bore and once or twice around the pin in accordance with well-known false twist practice.

As indicated earlier the horseshoe magnets are pivotally mounted in the frame 11 by means of the spigot 34 and the clamping means 37 and 38. By rotation of the magnets the positions of the fingers 50 with respect to the bands can be adjusted so that the spindle can be held in a position in which it extends parallel to the axis of the cylindrical member 28 or inclined to the axis in either direction. Yarn tension tends to tilt the spindle in one direction and so the magnets are rotated to pretilt the spindle in the opposite direction so that in use yarn tension restores the spindle to a position in which it is parallel to the wheel axis.

The aforesaid baseplate 10 is formed with a hub 60 on the side of the step 13 remote from the frame 11 and projecting from the hub is a horizontally extending rod 61. The rod 61 is received in a hollow cylindrical sleeve 62 which has a polytetrafluoroethylene lining. The sleeve is formed at the upper end of a downwardly extending bracket 63. A rod 64 is secured to the lower end of the bracket 63 which rod extends parallel to the rod 61 and is received with clearance in a bearing 65 located in the lower end of a plate 66 secured to the underside of the plate 10. The baseplate and with it the false twisting heads are thereby slidably mounted with respect to the bracket. The bracket 63 is secured by bolts 66 to one end of a member 67 of a frame for supporting a number of false twisting heads.

As shown in FIG. 3 of the drawings the sleeve 62 is fonned on one side with an elongated closed slot 68 in which a pin 69 on the shaft 61 is slidable. Two pulley wheels 70, 71 are rotatably mounted about horizontal axes on the sleeve adjacent the opposite ends of the slot 68 respectively.

It will be appreciated that engagement of the pin 69 with either end of the slot 68 limits the travel of the sliding movement of the head. The length of the slot is such that the sleeve 26 on the shaft 24 of the head can be disengaged from either of the sides of the aforesaid drive belt 9 by sliding movement of the head.

Secured to the pin 69 is one end of a wire tether 72 the other end of which is secured to a weight 73. The wire tether can be led around either the wheel 70, or the wheel 71 and the weight acts to draw the pin 69 towards the end of the slot adjacent to the wheel around which the wire is passed. The false twist head can thereby be urged in either direction of its sliding movement with respect to the fixed sleeve.

As shown in FIGS. 1 and 2 of the drawings a lever 74 is pivotally mounted at 75 on the opposite side of the sleeve 62 to the slot.

An upwardly extending plate 76 is secured by screws 77 to one side of the baseplate 10. The plate 76 has sides which taper from a point adjacent the upper end of the plate to a point at the top of the plate. Fixed part way along one limb of the lever 74 is a projecting boss 78 which can be engaged with the lower part of one or other side of the cam plate 76 and thereby prevents sliding movement of the baseplate l0 and the false twist head in one or other direction. The arrangement is such that when the boss 78 is engaged with one or other of the sides of the cam plate 76 the false twist head is at one or other of the limits ofits sliding movement.

The other limb of the lever 74 is provided with a resilient detent 79 which is engageable by swinging of the lever in one of two spaced holes 80, 81 formed on the sleeve and located so that when the detent is engaged in the hole 80 the lever is positioned so that the boss 78 is engaged with one or other of the sides of the cam plate 76 and when the detent is engaged in the hole 81, the lever is positioned so that the boss 78 is held clear of the cam plate 76.

I claim:

1. In apparatus for false twisting yarn, the combination of a support, a false twisting head having a yarn engaging device, a rotatable drive shaft for driving said yarn engaging device on said support, an endless movable belt which is arranged for driving engagement with said shaft, guide means mounting said head on said support for sliding movement between a first position in which the shaft is on one side of the path of travel of the belt and a second position in which the shaft is on the other side of the path of travel, and means for selectively biasing the head towards one or other of those positions so that the shaft can be urged into engagement with one or other sides of the belt.

2. An apparatus as claimed in claim 1 wherein the guide means mounts the head for linear movement between said first and second positions.

3. ln apparatus as claimed in claim 1, weight means biasing the head is biased towards one or other of the two positions, a tether to one end of which the weight means is secured, the other end of the tether being anchored to the head, two guides mounted on the support at locations spaced apart in the direction of said movement, the tether being anchored to the head at a location between the two guides and being led around one or other of the guides so that the weight means acts to urge the head in one or other of said directions.

. An apparatus as claimed in claim 3 wherein the two guides comprise rollers mounted on the support for rotation about horizontal axes extending transverse to said direction of movement of the head.

5. An apparatus as claimed in claim 1 wherein the guide means comprise a rod on said head and a sleeve on said support in which the rod is slidably engaged.

6. An apparatus as claimed in claim 5 wherein limit positions of sliding movement of the head are defined by the ends of a slot extending along the sleeve, a pin on the rod being slidable in said slot.

* i 1! l I 

1. In apparatus for false twisting yarn, the combination of a support, a false twisting head having a yarn engaging device, a rotatable drive shaft for driving said yarn engaging device on said support, an endless movable belt which is arranged for driving engagement with said shaft, guide means mounting said head on said support for sliding movement between a first position in which the shaft is on one side of the path of travel of the belt and a second position in which the shaft is on the other side of the path of travel, and means for selectively biasing the head towards one or other of those positions so that the shaft can be urged into engagement with one or other sides of the belt.
 2. An apparatus as claimed in claim 1 wherein the guide means mounts the head for linear movement between said first and second positions.
 3. In apparatus as claimed in claim 1, weight means biasing the head is biased towards one or other of the two positions, a tether to one end of which the weight means is secured, the other end of the tether being anchored to the head, two guides mounted on the support at locations spaced apart in the direction of said movement, the tether being anchored to the head at a location between the two guides and being led around one or other of the guides so that the weight means acts to urge the head in one or other of said directions.
 4. An apparatus as claimed in claim 3 wherein the two guides comprise rollers mounted on the support for rotation about horizontal axes extending transverse to said direction of movement of the head.
 5. An apparatus as claimed in claim 1 wherein the guide means comprise a rod on said head and a sleeve on said support in which the rod is slidably engaged.
 6. An apparatus as claimed in claim 5 wherein limit positions of sliding movement of the head are defined by the ends of a slot extending along the sleeve, a pin on the rod being slidable in said slot. 